|To:||"Pat Barthelow" <firstname.lastname@example.org>|
|Subject:||Re: [TowerTalk] Tower Trailer Safety;maintainence|
|From:||Jim Lux <email@example.com>|
|Date:||Fri, 14 Jan 2005 15:26:51 -0800|
You might want to talk to Michael Tope (W4EF@dellroy.com) or Marty Woll (N6VI) about CalTech ARCs tower trailer. It has outriggers, a crank up tower, etc.
At 11:04 AM 1/14/2005, you wrote:
For the CITARC trailer, you shove a bar in across the tower section to prevent the tower from retracting, then crank it down onto the stop, so the cable hoist isn't bearing any load. Hardly a fully engineered solution, but it seems to work.
The CITARC trailer uses square steel tubing for outriggers.
has some pictures of the trailer. In some of the pictures you can see the outriggers; take a look where the tower is being winched up vertical.
I am reading case histories of crane and tower accidents on the web, and have found a number of crane accidents (often fatal) that were caused by crane outriggers failing for a variety of reasons, often by putting more than allowable PSI on the ground, resulting in earth shifting, unbalancing the crane, and causing collapse. Or outriggers that were not of sufficient radius to ensure stability. Not wanting to experience this firsthand with the tower trailer, I want to learn more about outriggers, scrutinizing the adequacy of the two existing ones at the rear of the trailer.. The trailer is only a single axle, is about 18 ft front to rear, approx 7 ft wide, and
I did some quick calculations on overturning for a tower attached to a car, and the quick thing is that if the wind comes up, your in a heap of hurt, even with a tower trailer, unless your outriggers are comparable in length to the height of the tower.
Try this: http://home.earthlink.net/~w6rmk/antenna/mastcar.htm
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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